Water treatment plants in the cities along Rio Doce have resumed operations after improvements. The modernization works performed at 19 stations help water that is clean and drinkable at the end of the treatment process.
Furthermore, nine new wells were drilled in five cities along Rio Doce. Water from the wells goes through treatment systems and then flows into the supply network. Rural properties that are further from the river are supplied by tanker trucks.
How water treatment works
The treatment process consists of six main steps.
- Water capture: firstly, water from the Rio Doce is collected and taken to the treatment station.
- Coagulation of solids: then, the collected water receives clotting additives to facilitate the removal of solids therein. These additives turn the solids into small flakes.
- Odor removal: after the coagulation, powered activated carbon is added to the water in order to remove stronger odors;
- Decanting: at this stage, the small flakes formed in the coagulation step are separated from the water by gravity;
- Filtration: then, the water reaches the sand filters, from where it leaves clear and odorless;
- Chlorination and Fluorination: finally, fluoride and chlorine are added to the water to eliminate anything harmful to human health.